#include <REGX52.H>
#include <INTRINS.H>
void Delay(unsigned int xms)		//@11.0592MHz
{
	unsigned char i, j;

	while(xms--)
	{
		_nop_();
		i = 2;
		j = 199;
		do
		{
			while (--j);
		} while (--i);
	}
}

int main()
{
	unsigned char LEDNum = 0;
	P2 = ~0x01;
	while(1)
	{
		if(P3_1==0)
		{
			Delay(20);
			while(P3_1==0)
			{
				;
			
			}
			Delay(20);
			LEDNum++;
			if(LEDNum>=8)
			{
				LEDNum = 0;
			}
			P2 = ~(0x01<<LEDNum);
			
		}
		if(P3_0==0)
		{
			Delay(50);
			while(P3_0==0);
			Delay(50);
			if(LEDNum==0)
			{
				LEDNum=7;
			}
			else
				LEDNum--;
			
			P2 = ~(0x01<<LEDNum);
		}
	}
}